Fluid-pressure motor



F. E. COOPER FLUID PRESSURE MOTOR Apri! 2, 1946.

Filed April 14, 1944 INVENTOR. /afo Coo/2E@ Patented Apr. 2. 1946 UNITED STATES Y PATENT OFFICE 2,397,778 i FLUID-PRESSURE MOTOR Fred E. Cooper, Los Angeles, Calif.

Application April 14, 1944, Serial o.`530,9,77

8 Claims.

My invention relates to a Vfluid pressure motor of the multi-cylinder type and has for its principal object, to provide a motor comprising an elongated cylinder formed in sections, each section having a piston chamber with a piston therein and a piston rod carrying said pistons and arranged to reciprocate axially within the cylinder, such form of motor being particularly intended for the efficient operation of deep well pumps.

Further objects of my invention are, to pro'- vide in a multi-cylinder motor, new and novel joints between the cylinder sections, which joints include means providing bearings for the reciprocating piston rod and further, to provide a sim ple and efcient arrangement of ducts, for conveyingiiuid pressure to all of the piston chambers and the exhaust of expended pressure therefrom, which ducts extend lengthwise through the walls of the cylinder sections and the joints between same.

A further object of my invention is'to provide a multi-cylinder motor of the character referred to, wherein the diameter of the elongatedbody of the motor, composed of an in-line servies 'of cylinders, is minimized, in order that the motor may be advantageously employed in connection with the pumps of deep wells having tubes or casings of small diameters.

With the foregoing and other objects in view, my invention consists in certain novel features of construction and arrangement of parts, which will be hereinafter more freely described and claimed and illustrated in the accompanying drawing, in which: y

Fig. 1 is a longitudinal section through the center of a motor constructed in accordance with my invention, with parts broken away.

Fig. 2 is a vertical section taken on the line 2-2 of Fig. 1.

Fig. 3, is an enlarged horizontal section taken on the line 3--3 of Fig. 2.

Fig. 4 is an enlarged horizontal section taken on the line 4 4 of Fig. 2. .g

Fig. 5 is a perspective viewrof one cf the joint members.

Fig. 6 is a vertical section taken on the line 6--5 of Fig. 5.

Fig. 7 is a vertical section taken on the line 1-1 of Fig. 5.

Fig. 8 is an enlarged detail section taken on the line 8-8 of Fig. 7.

Fig. 9 is a vertical section taken on the line 9-9 of Fig. 7.

Referring by numerals to the accompanying drawing which illustrates a preferred embodiment of my invention, I0, II and I2 designate the three upper sections of the motor body, which sections are formed of metal tubing of suitable length and diameter.

The body may be composed of an indeiinite number of sections and thus the complete motor may have a length of ten or twenty feetfwith a diameter of from three to eight or more inches which enables said motor to be conveniently used in well pipe or casing of small diameters.

,Upper section Ii) of the motor body, which dif-` fers somewhat from the identical lower sections II and I2,` is closed at its upper end by a cap I3'carrying a bail. I4, by means of which the motor is suspended, raised and lowered and passf ing through a gland I5 in the top of said cap, is

a fluid pressure supply pipe I6. v

Formed in the side wall of cap I3 and the upper vportion of the wall of tube section IU Vin the upper half of the latter is a pair of exhaust ducts 22 which extend upward through the upper portion, of the plug with their open ends located on the flat vertical face of said plug above the intermediate portion 2I. Thus the inner ends of these ducts 22 communicate with the exhaust chamber 23 in section III between cap I3 and plug I8.

Fluid pressure ducts 24 are formed in the lower half of the intermediate portion 2I of the plug, which ducts extend downward through the lower portion of said plug with their open inner ends located on the flat vertical face of plug I8 below portion- 2I.

The open inner ends of the ducts 22 and 24 just described, function as ports and mounted for reciprocatory movement on the flat faces of the plug above and below intermediate portion 2| is a slide valve 25 which controls said ports such action taking place at the termination ofv the reciprocating strokes of the piston rod.

A guire 3l, either on the piston rod or tube i may be provided for the lower rod 26.

Piston rod 30 passes axially downward 5thrciiigli those tube sections including sections-H .and It which form the body of the motor rand through motor body and through ducts 38 in joint members 32, to act on the pistons 34, also for the exhaust pressure to pass through ducts 43 in the motor sections and through ducts 40 in said joint members, to chamber 23 and exhaust outlet I1.

As iiuid pressure enters the piston chamber above the pistons therein, the latter are driven downward and the spent fluid pressure beneath the pistons passes out and upward vt0 exhaust chamber `23 and thence to atmosphere through port I1. YThe flow of fluid pressure to the ducts which iead to the piston chambers and the exhaust of A vspent pressures from said chambers, is -controlled by the slide valve 25 and the timing of the latter is controlled by the piston rod as the latter ap- Vpreaches and reaches the end of its travel.

cylindrical joint members such as 32 which yeonnect the ends of .said sections.

The lower end of piston rod `passes through a gland -or stufng boxat the lower -end of the lowermost tube section and is `suitably connected to a pump rod.

The spacewithin .each section of the body provides a piston ,chamber 33 and carried by the piston rodwithin each chamber, `is a piston such as 34 arranged in the lower portion of each joint member 32 and surrounding the piston rod is a gland or stuing box 35. e

Each joint member 32 comprises a short cylindrical body externally threaded so that it may be screw seated in the adjacent ends of tube sections such as l0 and I1 or il and l2 and screwseated on each member between the vends of the tube sections are lock rings .or nuts r36, having recesses 3'1 for the reception of a Spanner wrench and as illustrated in Fig. 1 the ends of these lock nuts andthe ends of the tube sections may be correspondingly countersunk and chamfered.

Leading downward from the top of each joint member 32 is a pair of pressure inlet ducts 38,

vwhich terminate near` the lower end of said memand bottom of `said body are'branch ducts 4I (see Figs. 5 and 6).

Formed inthe Vouter faces of all of the tube sections of the motor are four longitudinally disposed grooves, two of which .42, function .as fluid pressure supply ducts and the other two 43, provide exhaust ducts.

l-Overlying each duct and secured tothe tube by welding or .otherwise is a metal strip 44 which provides a cover plate and :formed through the ends thereof and communicating `with the end of the covered duct and the outer end of the correspending branch duct (39 or 4 I) isanzaperture 45.

This aperture enables a short tubular .member such as 4S to be screw seated -in the Wall 'of strip 44 and in the underlying branch duct and after said tubular member has been thus seated, a cap plate such as 4l is welded to strip 44 over said aperture 45.

The arrangement 1of ducts just described provides for the conduction of fluid pressure from `pressure chamber .20 downward successively through the ducts 42 in all the sections of the The formation of the motor body in sections, enables a motor of any desired length to be produced and the arrangement whereby the iiuid pressure and exhaust ducts are formed by grooving the .body sections, enables the highest grade Vtubing tobe utilized in the building .of the motor, with a material reduction 'in production Vcosts las compared to construction involving special castings and patterns therefor.

Thus 'it will be seen that I have provided a multi-cylinder motor especially adapted Afor the operation of deep well pumps and which motor is simple in construction, inexpensive of manufacture and very effective in performing the functions for which it is intended.

It will be understood that minor changes in the size, form .and construction of thevarious parts of my improved motor may be made and substituted for those herein shown and described without departing from the spirit Iof ,my invention, the scope of which is sei-l forth n the appended claims.

I claim as my invention:

l. In a fluid pressure motor, an elongated body f Ywhich communicate with the `ducts in said cylinders and with the chambers within said Cylinders between said joint members, 'and plugs screw- 'seated .in said cylinders, and ,joint members between the ends of the ducts therein.

2. A iiuid pressure motor as set forth in claim 1 and Vwith valvular means actuated byV said piston rod for controlling the flow of kfluid pressure and thetexhaust of spent fluid .pressure through 7said uc s.

Y 3. A fluid pressure motor as set forth'in claim l with the ends of said cylinders being bevelled and .lock nuts screw seated on said joint members loetween the lends of said .cylinders the ends of which lock nuts `are .countersunk .for the reception Abf the Vbevelled ends of said cylinders. f Y

4. In a fluid pressure motor `a hollow cylinder provided in the outer face of its wall with 'longitudinally disposed fluid pressure and exhaust ducts cover strips secured to said cylinder and overlying the .ducts therein .and plugs closing the ends of said cylinder, which v.plugs are provided with fluid pressure and exhaust `ducts which'communicate respectively with the iiuid pressure and .exhaustducts in said cylinder. v

5. In a uid pressure motor, a seriesof axially aligned cylinders, joint members connecting the ends of said cylinders, the walls of which cylinders are provided in their outer faces with longitudinally disposed uid pressure inlet and exhaust ducts, cover strips secured on the outer faces of said cylinders over the ducts therein, said joint members provided with inlet and exhaust ducts which' communicate with the corresponding ducts in said cylinder screw-plugs seated in the walls of said cylinders and said joint members at the points of communication between the ducts there,- in, a cylinder at the upper end of the series of connected cylinders, provided with a compressed fluid chamber and an exhaust chamber, valvular means arranged for operation between said compressed uid chamber and exhaust chamber for controlling the ow of fluid pressure to and through the ducts in said cylinders and joint members, and a piston rod extending axially through said cylinders and joint members.

6. The fluid pressure motor as set forth in claim 5 and means for actuating said valvular means at the ends of the travel of said piston rod.

7. The fluid pressure motor as set forth' in claim 5 with the ends of said cylinder being bevelled and lock nuts located on said joint members between the ends of said cylinders the ends of which lock nuts are countersunk for the reception of the bevelled ends of said cylinders.

8. In a fluid pressure motor a cylinder, provided in its outer face with longitudinally disposed channels, cover strips secured to the outer face of th'e cylinder and overlying said channels plugs seated in the ends of said cylinder, which plugs are provided with ducts which communicate with the channels in said cylinder, and tubular plugs screw-seated in said cylinder and plugs at the points of communication between said channels and ducts.

` FRED E. COOPER. 

